String mainpulations

string_mainp.cpp

#include <string>
#include <iostream>
#include <algorithm>


namespace detail {
template<class CharT, class Traits, class SAlloc, class VAlloc> 
void
string_split_impl(std::basic_string<CharT, Traits, SAlloc> const& str, CharT delim,
                  std::vector<std::basic_string<CharT, Traits, SAlloc>, VAlloc>& pieces)
{
  if(!str.empty())
    {
      pieces.reserve(1ul + std::count(str.begin(), str.end(), delim));
      size_t beg = 0ul, end = str.find(delim, beg);
      pieces.push_back(str.substr(beg,end));
      beg = end + (end < str.size());
      for(; end < str.size(); beg = end + (end < str.size()))
        {
          end = str.find(delim, beg);
          pieces.push_back(str.substr(beg,end));
        }
    }
}
template<class Iterator, class CharT, class Traits, class Alloc>
void
string_join_impl(Iterator first, Iterator last, CharT delim,
                 std::basic_string<CharT, Traits, Alloc>& str)
{
  if(first != last)
    {
      str += *first++;
      while(first != last)                                                                            
        {                                                                                             
          str += delim;                                                                               
          str += *first++;                                                                            
        }
    }
}
} // end namespace detail

inline std::vector<std::wstring>
string_split(std::wstring const& str, wchar_t delim)
{
  std::vector<std::wstring> pieces;
  detail::string_split_impl(str, delim, pieces);
  return pieces;
}

inline std::wstring
string_join(std::vector<std::wstring> const& pieces, wchar_t delim)
{
  std::wstring str;
  detail::string_join_impl(pieces.begin(), pieces.end(), delim, str);
  return str;
}

int main()
{
  wchar_t delim = L':';
  const wchar_t* strings[] = { L"", L"a", L"asd", L":", L"::", L"a:", L":a", L"a:b" };
  for(const wchar_t* str : strings)
    {
      std::wcout << L"\"" << str << L"\": " << string_split(str, delim).size() << std::endl;
    }
  return 0;
}